/* 手机端 */
@media(max-width: 620px) {
    .content-left-div {
        margin-top: 0.2em;
        width: 100%;
        height: 19em;
        background-image: linear-gradient(#e66465, #9198e5);
        border-radius: 0.5em;
    }
}

/* 平板端 */
@media screen and (min-width:620px) and (max-width:980px) {
    .content-left-div {
        margin-top: 0.2em;
        width: 100%;
        height: 19em;
        background-image: linear-gradient(#e66465, #9198e5);
        border-radius: 0.5em;
    }
}

/* 电脑端 */
@media(min-width: 980px) {
    .content-left-div{
        width:25%;
        height:100%;
        border-right: 1px solid rgb(255, 255, 255);
        background-image: linear-gradient(#e66465, #9198e5);
        border-radius: 0.5em;
        position: fixed;
        margin-left: 1%;
        margin-top: 0.2em;
    }
}